Thread-cutting atttachment for sewing-machines.



J. P. W-BIS. THREAD OUTTING ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED JULY1 1907.

Patented Dec. 5, 1911.

iMllii UNITED STATES PATENT OFFICE- JOHN IP. WEIS, OF NYACK, NEW YORK, ASSIGNOR- T0 METROPOLITAN SEWING MACHINE COMPANY, OF NYACK, NEW YORK, A CORPORATION OF NEW YORK.

THREAD-CUTTING ATTACHMENT FOR SEWING-MACHINES. 7

Application filed July 1, 1 9077. Serial No. 381,602.

To all whom it may concern:

Be it known that I, J OHN P. WEIS, a citizen of the United States, residing in N yack,

county of Rockland, and State of New York, have invented a new and useful Improvement in Thread-Cutting Attachments for Sewing-Machines, of which the following is a description.

This invention relates to thread-cutting attachments for sewing machines, and has special reference to devices by means of which the threads,

or chain of stitches, may

be cut or severed sit any time it is desired toremove the work from the machine. Among the objects of my invention may be noted the following: to provide a threadcutting attachment which is always ready and in position to cut the thread and which is in such convenient position relative to the stitching-point that the thread can be quickly severed at the end of a stitching operation close to the stitching-point and at any time it is desired to remove the work from the nfachine; to provide a cutting attachment which, While the machine is in operation, .is

constantly in motion, whereby it always presents an open jaw and never becomes clogged, and is always activeso as to positively cut the thread presented to it; to provide a thread-cutting attachment for sewing machines -,-so located: with reference to the stitching-point that it will be in convenient position to slip the thread under its cuttingblade and which, irrespective of whether the machine is running or at a standstill will always be in conditf on to cut the thread,

the ends of which will free themselves from the cutters.

With the above objects in view, and others which will be detailed during the course of this description, my invention consists in the parts, features andco nbinations of elements hereinafter described and claimedieh form part of this specification: Figure 1 is a View partially in elevation and partially in section, the

section being'taken transversely of the machine and beside the feed-bar, illustrating the cutting attachment and its operating mechanism, togetherwith its locatiomin the machine; Fig. 2 is atop-plan'view of a por tion of the bed-' late of the machine showing the structure of the throatand cloth-plate and part of the thread-cutter actuating Specification of Letters Patent.

PatentedDec. 5, 1911.

mechanism; Fig. 3 is a perspecive View of the thread-cutting plate; Fig. 4 is a detail showing another form of my invention, the view being a and Fig. 5 isa section through the cutter.

In the drawings, the numeral l indicates the bed- 'alate forming part of the machineframe, and 2 indicates, the cloth-plate, 3 being a portion of the head of the machine in which the needle-bar and presser-bar 5 operate.

The numeral 6 indicates the needle and 7 the foot 8, which is secured to the shank by means of the screw 9. i Onegof the standards 10, in which the driving-shaft 11 is journaled, is illustrated by dotted lines in Fig. 1 and in top-plan in Fig. 2. A looper-carrier supporting-plate 12 is shown in Fig. 1, in which. plate the carrier 13 is journaled in any usual manner,

at .1ts upper end,

said carrier supporting, the looper 14, which cooperates with the partial section and elevation;

presser-foot shank carrying the presserneedle 6. Thethroat-plate 15 is supported by the cloth-plate 2 and is provided with the several slots 16, through which the feeddogs operate, and also with the tongue 17 over which the stitches may be formed, as in anordinary overedge-stitching machine. A slide-plate, whi 11 covers the usual opening-in the clothlate, is indicated by 18. On the forward end of the driving-shaft 11, {feed-actuating eccentric is carried, which is surrounded by the strap 19, the other end of which is journaled upon the shaft 20, carried in the upper end of the feed-rocker frame 21, journaled at its lower endin the bed-plate of the machine by means of the shaft 22. The feed-bar 23 is journaled at its rear end upon the shaft 20 at the top of the feed-rocker frame 21 in usual manner, and at its forward end is connected pivgtally, as at 2-4,.to the upper end of a strap 5, surrounding an eccentric 26, carried by the driving-shaft of the machine. Thus,

the feed-bar is given its feeding or reciproeating movements and its vertical rise and fall, constituting the usual four-motion feed. The forward. end of the feed-bar.

carries the. 'feed-do 'f27, which operates through the slots 1 in the throat-plate. Secured to the rear end of the throat-plate 15, at its outer side, and beside the feed slots, is auplate or ledger-blade 28 held in place by means of screws 29 with its inner edge projecting slightly over the slot 30 in the cloth-plate, which latter extends parallel with the inner edge of said plate 23.

Through the said slot 30 plays the cutter- .blade 31, the cutting-edge 32 of which cooperates with the inner edge of the plate 28,

'so as to produce a shearing cut. The cutt r blade, as shown in Figs. 1 and 3. is in the form of a bell-crank lever and is pivoted at 33 to the throat-plate in the slot 30 thereof, and the depending arm of said lever is bifurcated to provide the opposite parallel prongs 34 between which plays, or with which cooperates, the actuating screw or pin 35, which is tapped into the side of the front end ofthe feed-bar, as clearly shown.

non cutting portion, to the work as it is fed and enabling said work to slide over the top of theblade. From the above detail description, the mode of operation of this form of my invention, now to be set forth, will be readily understood.

' In the operation of the machine, the feed takes place in the direction of the arrow shown in Fig. 2 and, therefore, the work is advanced across the throat-plate from front to rear. The movement of the feedbar longitudinally will reciprocate the cutter-blade so as to cause it to cooperate with the inner edge of the plate or ledger-blade 28 and work in the slot 30.of the throatplate. Thus, while the machine is running,

the threadcutter is' kept constantly in operation and will automatically sever the thread, or other material which is run in under the reciprocating blade. ,The' vertical rise and fall of the feed-bar has practically 'no action on the cutter-blade, for

the reason that the slot 36, between the prongs 34, is sufiiciently' 'long to ,prevent Y the screw from having any action on ,Sitld blade. 'At the end of a stitching op eration, whether the machine is stopped or not, the fabricwill be withdrawn from the rear of the'presser foot and the stitching mechanism"will produce a chain of stitches,

or else strands of needle-thread, and maybe doopcr-thread, will be drawn out and will have to be severed, the usual way being to use a pair of-scissors. With my cutting-knife in.

the position indicatedand operating as described, the thread can be readily slipped cutting-edge of the inactive blade.

.ent'. is

under said reciprocating blade, or under said blade if the machine is at rest, and the thread quickly severed by drawing the same against the cutting-edge 32 of the said knife. Thus, the operator does not have to hunt for his scissors, or depend upon any other implements, such as a ack-knife,

.to sever the thread or chain of stitches.

In the form of Figs. at and 5, the cutterblade is carried bodily by the feed-bar and the feed is shown as the differential type.

The main feed-bar 23, carries at its front end the feed-dog 27, and the suppleii ental feed-bar 37 with its feed-dog cooperates in usual manner with the bar 23. The feeddog 27 is extended laterally at 38 so as to provide a support for the thread-cutter 39' secured to the side of said extension. 38 by means of screws l0, passing through the cutter-shank 41, the cutter thus moving bodily with said dog. The cutter extends 111) through the slot 30 in throat-plate 15 and cooperates with the plate 28, the latter operating also in both forms of my invention as a rest for the work and guide for the cutter-blade. Thus, as the four motions are imparted to the feed, the cutter will be operated and the plate 28 will guide said cutter and cooperate with the latter to cut the thread. lhe cutter in both forms of my invention will always be in contact with the ledger-blade or plate 28 and the two will have a shearing action, the cuttingcdge of the active, blade running along the In both forms the cutting action is positive and certain.

If it is desired to clip the goods for any reason, or notch the same, as is often the case m ta1lor1ng ,,or to trim the same-for a .short length, these operations can be readily performed by simply running the goods under the reciprocating blade. If the machine is at rest and the feed happens to be at its forward stroke, thread may he slipped against the cutting-edge 32 of the blade or knife and readily cut. This will be clear upon viewing the dotted-line position of the knife or blade indicated by a; in Fig. 1. i

Having thus described my invention, whz t I claim and desire to secure by Letters Pa1- 1. In combination. with the feeding mechanism of a sewing machine having a feed-dog operating tofeed the work in a given direction; a thread-cutting blade mounted so as to have vibratory motion and having its cutting-blade projecting through the work-plate of the machine at a point out ,of-,fland remote from, the path of the feed, said blade extending in the general direction of the feed and paralleltherewith so. as to present its back, or non-cutting portion, to the work as the latter is fed past the stitching position, thus providing a deflectpoint out of, and remote from, the feed, said blade extending in of the machine in rear of the stitching position and having its cutting-blade extending through the Work-plate of the machine at a the path of the general direction of the feed and parallel therewith 'so as to present its back, or non-cutting portion, to the work as it isfed, thus providing a deflecting portion to enable the work to Slide Over the f th blade; and sai device having its cutting-j aw normally open in the general direction of the feed of the Work; and means for actuating said cuttingblade.

3. In combination with the feeding mechanism of a sewing machine having a feeddog operating to feed the Work in a given direction; a thread-cutting mechanism comprising a cutting-blade extending through the work-plate of the machine at a point out of, and remotefrom, the path of the feed, said blade extending in the general direction of the feed and parallel therewith so as to present its back, or non-cutting portion, to the work as it is fed, thus providing a deflecting portion to enable the work to slide over the top of the blade; means for act-u ating said blade; a ledger-blade supported at an angle to the cutting-blade and operating to guide and brace the latter; and said two blades forming a jaw normally open in the general direction of the feed of the work.

4. In combination with the feeding mechanism of a sewing machine having a feeddog operating to feed the work in a given direction; a thread-cutting device comprising two blades supported by the machine- "frameand one ofwhich blades ismovable relatively to the other and extends through the work-plate of the machine at a point out of, andremote from, the path of the feed, said blade extending in the general direction of the feed and parallel therewith so as to present its back, or non-cutting portion, to the work as it is fed, thus providing a deflecting portion to enable the work to slide over the top of the blade; the two blades providing a cutting-jaw normally open in the general direction of the feed of the work; and the two blades being arranged the one with its edge in contact with the body and cutting edge of the other blade, whereby the movable blade is braced and guided by the other.

In testimony whereof I have hereunto signed my name in the presence of wo sub scribing witnesses.

JOHN P. WVEIS;

Witnesses Fnrrz Brennan, LULU Guoss. 

